The ultimate goal of covert communication is to achieve shadow wireless networks. Preliminary results towards this goal have been achieved in the context of relay networks. Covert communication with the aid of relay was analyzed in [1]}, [2]}, [3]}, [4]}. The scenario investigated in [1]} is that there is a source node which attempts to transmit information to a destination node via a relay node. The relay node receives a message from a source node and then attempts to retransmit the source's original message in addition to its own covert message to the destination without the source node detecting the covert transmission. This work presents two schemes (rate-control and power-control) for evaluating the probability that the covert criteria is satisfied.
